Re: "i2c_hid: Could not register for interrupt, irq = -1" on Thinkpad Tablet 10

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Hi,

On Sat, Jan 31, 2015 at 10:01 AM, Sebastien Bourdeauducq <sb@xxxxxxxxx> wrote:
> Hi,
>
> among the many problems that the Baytrail-based Thinkpad Tablet 10 has under
> Linux, the built-in Wacom digitizer does not work. I get the following
> messages in the kernel log (with i2c_hid.debug=1):
>
> [  593.224249] i2c_hid i2c-WCOM0008:00: Fetching the HID descriptor
> [  593.224259] i2c_hid i2c-WCOM0008:00: __i2c_hid_command: cmd=01 00
> [  593.243080] i2c_hid i2c-WCOM0008:00: HID Descriptor: 1e 00 00 01 ee 00 02
> 00 03 00 0a 00 00 00 00 00 04 00 05 00 6a 05 14 01 02 03 00 00 00 00
> [  593.243110] i2c_hid i2c-WCOM0008:00: Could not register for WCOM0008:00
> interrupt, irq = -1, ret = -22

That means that your tablet is the first one we (maybe only I) see
that uses a GPIO as an interrupt :)

Mika sent a patch recently which should solve your problem.
Can you give a try to the following patch?
https://patchwork.kernel.org/patch/5709961/

> [  593.253422] i2c_hid: probe of i2c-WCOM0008:00 failed with error -22
>
> What should I look at?
>

So if you can test the above patch, that would help. If it does not
work, we will need to check the DSDT of your tablet.

Cheers,
Benjamin
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